Power up your special move that you have had since the beginning of the game. For example, Ryudo's Tenseiken Slash. Power it up to the maximum and you will have a better chance of winning. When Millenia has absorbed The Eye of Valmar, raise the special move "Spellbinding eye" to the maximum. When you encounter a Boss, use that move. The boss will be paralyzed and will be harmless. You can now hit it with your best spells and special moves. Note: The special move has a time limit.